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Terahertz wave polarization conversion and unidirectional transmission device with double-layer dielectric-metal grating structure

A metal grating and polarization conversion technology, applied in the field of terahertz applications, can solve the problems of polarization conversion rate, isolation, insertion loss working bandwidth that cannot meet the application system, low forward transmission transmittance, affecting device practicability, etc. Achieve the effect of overcoming the shortcomings of single function, low material cost and simple structure

Inactive Publication Date: 2019-03-05
NANKAI UNIV
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Problems solved by technology

However, although these devices can achieve a one-way transmission isolation of more than 20dB, due to the high-order diffraction effect of the device, the forward transmission transmittance is very low and the working bandwidth is also very narrow, which affects the practicability of the device.
[0004] To sum up, on the one hand, the development of terahertz application systems has an urgent demand for the development of high-performance terahertz polarization conversion and unidirectional transmission devices; rate, isolation, insertion loss, and working bandwidth cannot meet the actual needs of the application system. It is urgent to develop terahertz polarization conversion and unidirectional transmission without external magnetic field, high polarization conversion rate, high isolation, low loss, and easy processing. device

Method used

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  • Terahertz wave polarization conversion and unidirectional transmission device with double-layer dielectric-metal grating structure
  • Terahertz wave polarization conversion and unidirectional transmission device with double-layer dielectric-metal grating structure
  • Terahertz wave polarization conversion and unidirectional transmission device with double-layer dielectric-metal grating structure

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Embodiment Construction

[0024] The terahertz wave polarization conversion and unidirectional transmission device with a double-layer dielectric-metal grating structure involved in the present invention will be described in detail below with reference to the accompanying drawings.

[0025] figure 1 It is a structural schematic diagram of a terahertz wave polarization conversion and unidirectional transmission device with a double-layer dielectric-metal grating structure in an embodiment of the present invention, and the structure is as follows. A dielectric grating layer with a period of 50 μm, a gate ridge width of 30 μm, and a gate groove depth of 200 μm is etched on one side of a high-resistance silicon wafer with a thickness of 500 μm. The resistivity of the high-resistance silicon is greater than 10KΩ·cm. A metal grating layer with a period of 20 μm and a metal grid strip width of 14 μm is plated on the other side of the substrate, the metal material is gold, and the thickness of the gold layer is ...

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Abstract

The invention discloses a terahertz wave polarization conversion and unidirectional transmission device with a double-layer participating medium-metal grating structure. The device comprises a metal grating layer, a medium substrate layer and a medium grating layer, wherein the metal grating layer and the medium grating layer are respectively positioned on two sides of the medium substrate layer; the medium grating layer is etched by a substrate material; an included angle between ridge orientation of medium grating and ridge orientation of metal grating is 45 degrees; the metal grating and the medium grating are sub-wavelength gratings; and the grating periods of the sub-wavelength gratings are smaller than the wavelength incident light. By the polarizing character of the metal grating layer and the artificial double refraction character of the medium grating layer, polarization conversion rate greater than 95% can be realized, and unidirectional transmission isolation greater than 30 db can also be realized. Due to the mode coupling effect between the metal grating layer and the medium grating layer, compared with a discrete component, the device has the characteristic that the emergent light transmissivity and working bandwidth are remarkably improved. The device is suitable for polarization conversion and unidirectional transmission of terahertz waves.

Description

technical field [0001] The invention belongs to the technical field of terahertz applications, and in particular relates to a terahertz wave polarization conversion and one-way transmission device with a double-layer dielectric-metal grating structure. Background technique [0002] Terahertz wave refers to the oscillation frequency in 10 12 Hz(1THz=10 12 Hz), this band is between microwave and light wave, and it is the intersection field of electronics and photonics. Terahertz wave technology mainly involves research on terahertz wave radiation sources, detectors, transmission, functional devices and related applications of terahertz waves, among which terahertz functional devices involve filtering, modulation, phase shifting, polarization conversion and other devices. Polarization conversion element is a device that changes the polarization state of incident light into another polarization state after passing through the device. It has important applications in the fields...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30
CPCG02B5/3033
Inventor 胡福泰许士通范飞
Owner NANKAI UNIV
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